1000 VAR QUESTION 5 A load has a impedance of 8+j6, what will be the power...
A three-phase, Y-connected, 6.9-kV, 8-pole, 60-Hz, synchronous motor has a synchronous impedance of 0.01+j6 Ω/phase. The motor is energized at its rated voltage and frequency, and draws a line current of 100 A. The motor rotates a load, while operating at a lagging power factor of 0.9. Calculate the torque developed by the motor: (a) considering the armature resistance (b) neglecting the armature resistance
QUESTION 3 A 200 - MVA, 15/200 kV single-phase power transformer has a per – unit resistance of 1.2 percent and a per-unit reactance of 5 percent (data taken from the transformer's nameplate). The magnetizing impedance is impedance is j80 per unit. a. Find the equivalent circuit referred to the low-voltage side of this transformer. b. Calculate the voltage regulation of this transformer for a full-load current at power factor of 0.8 lagging. c. Assume that the primary voltage of...
Given: A 12.5 kV circuit has a load of 8000 kVA with a lagging power factor of 0.8. Required: How much capacitive reactive power is needed to correct the power factor to 0.92 lagging? Solution: Q= O kVAR's
Question 1 Load and Power Factor (Constant Rotor Field, E < V) Load and Power Factor (Constant Rotor Field, E = V) Load and Power Factor (Constant Rotor Field, E > V) Eno-load = V Eno-load 12 12 12 min = ? Omar = ? Amin = ? emax = ? Amin = ? emax = ? V : no-load Pmax Emar-load Emar-load Emax-lond chteh chteh chteh With reference to Chapter 4: Slides 22-24, determine the range of power factors...
8. (15 points) Assume we have a 100 kVA load with power factor pf= 0.8 lagging, and would like to correct the pf to 0.95 leading, please fill the following blanks: The real power before power factor compensation is The real power after power factor compensation is The reactive power before power factor compensation is The reactive power after power factor compensation is kW kW kVAR kVAR
1.6 load not in a three phase system) is rated at 50 KVA with a power factor of 0.8 lagging. A what is the power factor angle? 1.7. For a balanced three phase system, if the wye connected load has impedance 50+20j, determine the total (a single load, complex power of the load if 120225° V rms (ignore the line impedance). 1.8 An ideal transformer has a tuns ratio (N2/NI) of 6, if the magnitude of the primary port (port...
1. The one-line diagram of a three-pha se power system is shown in Figure 3.29. Select a common base of 100 MVA and 15 kV on the motor side. Draw an impedance diagram with all impedances including the load impedance marked in per-unit. The manufacturer's data for each device is given as follow:The three-phase load at bus 4 absorbs 57 MVA, 0.6 power factor lagging at 10.45 kV. Line 1 and line 2 have reactances of 48.4 Ω and 65.43...
UISIZULU Problem 4 A three phase, 5 kW, wye-connected load operate onnected load operates at 0.8 power factor lagging with a terminal voltage of 100 V (line to line). The cables connecting e bles connecting each phase of the load to the wye-connected supply has an impedance of (0.25 +0.25) 12. Compute the following: a) Reactive power drawn by the load. b) Real and reactive power losses in the system. me current and line voltage at the source terminals and...
Q1. A 30-km, 34.5kV, 50Hz, three-phase line has a positive-sequence series impedance Z-0.19+j0.34 2/km. The load at the receiving end absorbs 1OMVA at 33kV. Assuming a short line, calculate: a) the ABCD parameters b) sending-end voltage for a load power factor of 0.9 lagging c) sending-end voltage for a load power factor of 0.9 leading Ans: (a) A-D-1.00 pu. B-11.685<60.8°, C-0.0 mho, (b) V,-35.96 kVLL, (c) V,-33.39 kVLL
1002 Figure 2: For Questions 8, 9, 10 For the circuit shown in Figure 2, Pi = 80 W with pf = 0.8 lagging, |S2| = 60 VA with pf = 0.7 leading, S3 = 40 VA with pf = 0.6 leading, I = 0.4237ºArms). Note that subscripts specify the load, so P1 is the real power for Load 1, which has impedance 21. 8. Determine P. (a) 57 W (b) 42 W (c) 36.63 W (d) 84.14 W (e)...